Fact: Unless your left handed there is no reason to buy a Gen 4 over a Gen 3. Sorry, but I had to vent some steam. Sick of hearing about the malfunctions, "break-in periods", changing the recoil spring, adding .0000009 in. of backstrap to get the right grip angle, etc... The only andantage to a Gen 4 is for left handed shooters due to the ambidextrous controls. State some solid reasons other than "Because I want the newest, or Because I can" as to why you have bought or would buy a Gen 4, when the Gen 3's have virtually 0 problems out of the box.